Effect of Substituents on Phenazine Derivatives by Spectral Studies

Abstract

C NMR spectral data of prepared phenazines were correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the results of statistical analysis, the effect of substituents on the infrared frequencies (ν, cm -1 ) and 13 C nmr chemical shifts(δ, ppm) has been studied.

Spectral LFER Studies on Some Sydnone Chalcones

“…The general structure of (E)-4-(N-(4-cinnamoylphenyl)sulfamoyl)-3-(p-tolyl)-1,2,3-oxadiazol-3-ium-5-olates are shown in Fig.1. [13][14][15][16][20][21][22][23][24][25][26][27][28][29][30][31]of these data with Hammett substituent constants and Swain-Lupton's [33] parameters. In this correlation, the Hammett equation was taken in the form as(1).…”

“…The Chemical shifts (δ, ppm) of vinyl protons, NH and methyl protons of synthesised sydnone chalcones were presented in Table 3. These chemical shifts(δ, ppm) have been correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis [13][14][15][16][20][21][22][23][24][25][26][27][28][29][30][31][32]. In this correlation the Hammett equation was taken in the form as (20) δ = ρσ + δ o (20) where δ o is the frequency for the parent member of the series.…”

“…While seeking these in multi-regression analysis [33], they are worthwhile and produced satisfactory correlations. The generated multi-regression analysis equations are given in (21)(22)(23)(24)(25)(26)(27)(28). Table 5.…”

“…Thirunarayanan and his co-workers have studied the effect of substituents on spectral data of some oxazine-2-amines [26]. The spectral correlation of infrared and carbon-13 NMR data of quinoxaline and phenazine derivatives were studied by Thirunaryanan et al [27,28]. Senbagam et al, have studied the effects of substituents on some substituted (E)-N-benzylidene-4H-1,2,4-triazol-4-amines [29].…”

Infrared, ¹H and ¹³C NMR Spectral Studies of some 4-([1,1′-Biphenyl]-4-yl)-6-(Substituted Phenyl)-5,6-Dihydro-4H-1,3-Oxazine-2-Amines: Assessment of Substituent Effects

“…Proton nuclear magnetic resonance spectroscopic data were applied for prediction of E-and Z-conformations of unsaturated systems and spatial arrangements of cyclic systems [20]. Thirunarayanan et al, have studied the infrared and NMR spectral correlations of phenazine and quinoxaline derivatives [21,22]. Mayavel et al, have studied the spectral correlation of some E-imines [23].…”